[Al Skierkiewicz]

Everyone,
One of the biggest errors in terminating to the WAGO connectors is improper stripping of the insulation. WAGO recommends 5/8" to insure good contact inside the terminal. If you do that, and insert the wire so no copper is showing, then you have a good contact with the wire and it will not pull out. Please remember that these terminals are used in production environments and industrial installations. Installers rarely will insert the tool fully, they simply have learned the "feel" of inserting the tool, lifting while inserting the wire and then dropping the tool to lock the wire. While it takes two handed coordination, an experienced installer will take about 1 second for each termination.